Spindle for an engraving machine



FIG. 1 is an upper front perspective view of a spindle for an engraving machine showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a spindle for an engraving machine, as shown and described. 